1. Checking the log information of the switch, there are many TC protection enable record, it means that there are many TC BPDU receives by the CE6870. After receive TC BPDU, the mac address table and arp table will be refreshed. After refresh the mac address table and arp table, there will be broadcast to learn mac and arp again, that cause the traffic increase on the ports.

Apr 1 2018 06:59:45+05:30 SYSCON_NETMAGIC_CORE_SWITCH %MSTP/4/MSTPLOG_PROTC_GUARDED(l):CID=0x80542724;With the TC protection enabled, if TC BPDUs were received after the number of TC BPDUs received by an instance exceeded the threshold, these TC BPDUs were processed after the TC protection time expires. (ProcessID=0, InstanceID=1)

2. Checking the log record, there are many bandwidth usage exceeded record and the timing match the TC BPDU receives.

3. After confgire stp flush disable, the port usage become stable. After add this configuration, when the switch receives TC BPDU, it will not refresh the mac address table and arp table, so there will be no broadcast.

<HUAWEI> system-view

[~HUAWEI] stp flush disable

Root Cause

After receive TC BPDU, the mac address table and arp table will be refreshed. After refresh the mac address table and arp table, there will be broadcast to learn mac and arp again, that cause the traffic increase on the ports. Root cause is that find out the TC resource and fix it.

Solution

1. After confgire stp flush disable, the port usage become stable. After add this configuration, when the switch receives TC BPDU, it will not refresh the mac address table and arp table, so there will be no broadcast.

<HUAWEI> system-view

[~HUAWEI] stp flush disable

2. Use command display stp global to find out the TC resource and fix it.

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